No.

I have created, and am pointing to, other files:

VikingsIncUnit.txt
VikingsIncBldg.txt
MyHeroes.txt
...
VikingsInc.txt is the base file, and is modified from Early.txt;
...

The Building and Unit files are copied, then modified, from the base/default files.

I have copied and pasted from the Viking files into these files to accomplish my goal.

Thus, for sake of your question, basically, yes, I have modified the files you have mentioned (as I copied them in their original form to other file names then modified them).